I was out on the County Park lake yesterday evening.  Being small(ish), it is strictly a trolling motor (or paddle) only lake.  No gas motors whatsoever.  I observe (and hear) a boat which is moving at quite a fast clip (for a trolling motor) and I hear what sounds a lot like the "glub glub glub" of a small gas motor.  There is a trolling motor on the front but nothing on the back.  NOTHING.  Yet the back is where the prop wake is coming from. It LOOKS like a standard jon boat but something clearly seemed amiss.  Do they make small inboard/outboard motors for jon boats?  Could this person have been cheating?  Or was I imagining things?

 

Never seen and inboard/outboard but I've seen jetski engines put into Jon boats before. They couldn't be seen unless you looked inside the boat